Modern impressionistic windows are usually characterized by fine mouth-blown cathedral glass and have very little paint, if any. Instead of painting fine details such as robe folds or wood grain, the artist-designer carefully chooses glass for its character and ability replicate these details. Additionally, mouth-blown cathedral glass lends itself to more vibrant and striking colors in comparison to opalescent glass. Where opals are more opaque and provide denser colors, mouth-blown glass has greater transparency, which allows more sunlight to filter through, thus creating brighter windows.
Modern Impressionistic stained glass generally focus more on symbols, shapes, and color, as opposed to scenes with human figures. These windows use more abstract designs to convey Christ’s message through color and symbolism.